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Pension and Other Benefit Programs - Benefit Obligation, Benefits Paid During the Period, Accrued Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Change in benefit obligation:      
Benefit obligation at the end of year $ 598 $ 644 $ 647
Interest cost 29 30 17
Actuarial (gain)/loss (28) 14  
Benefits paid (47) (47)  
Amounts recognized in the accompanying consolidated balance sheets:      
Accrued employee benefits (170) (193)  
Post-retirement Benefit Plans      
Change in benefit obligation:      
Benefit obligation at the end of year 116 129 $ 116
Interest cost 5 5  
Actuarial (gain)/loss (7) 19  
Employee contributions 2 2  
Benefits paid (13) (13)  
Amounts recognized in the accompanying consolidated balance sheets:      
Other current liabilities (9) (9)  
Accrued employee benefits $ (107) $ (120)